I have Windows XP installed, followed by Mint 12 and finally Ubuntu 12.04. I did a sudo grub-install /dev/sda followed by sudo update-grub. On rebooting all was fine and the boot menu had Ubuntu 12.04, mem, windows, and finally Mint 12.

All was fine till now. Today wanted to boot into windows BUT found Wiindows XP missing from boot menu.

Tried sudo grub-install /dev/sda followed by sudo update-grub, BUT Windows XP is NOT FOUND.

Can someone help with what to do to restore Windows XP in the boot menu, please?